Features of the Smartwool Men's Merino 150 Polo Moisture management, temperature regulation, and odor resistance of merino with the durability and quick dry time of polyester Offset shoulder and side seams designed to increase comfort and minimize chafing while wearing a backpack 3 button placket and vent at bottom hem provide classic look UPF 20+ Fabric Details 87% Merino Wool, 13% Nylon